Methods for patient-specific shoulder arthroplasty

摘要

A method of determining an optimal position of a glenoid implant. The method includes identifying a center point of a patient's glenoid fossa based on an image of the patient's glenoid fossa; determining the optimal position of the glenoid implant based on the location of the center point relative to a medial point of the patient's scapula; and selecting orientation of an alignment pin based on the determined optimal glenoid implant position such that the glenoid fossa will be prepared to receive the glenoid implant at the optimal position when the glenoid fossa is prepared with a cutting device or guide coupled to the alignment pin.

主权项

1. A method of determining a desired implantation position of a glenoid implant comprising:
identifying a center point of a glenoid fossa on a virtual model of a patient's scapula using software run by a processor, the software identifying the center point using a best fit circle referenced off of three equally spaced points at the glenoid fossa, the three equally spaced points located at three of the following: an anterior rim, a posterior rim, a superior rim, and an inferior rim, wherein at least the center point is visually displayed on the virtual model and the virtual model is created from an anatomical image of a patient's scapula; determining the desired implantation position of the glenoid implant as a line that passes through both the center point and a medial point of the virtual model of the patient's scapula identified using the software; and selecting an orientation of a virtual alignment pin using the software and visually displaying the orientation of the virtual alignment pin on the virtual model at an angle from the determined desired implantation position; inserting a surgical alignment pin into the patient's scapula, the surgical alignment pin positioned according to an orientation assigned virtually using the software and corresponding to the orientation assigned to the virtual alignment pin.